Codebusters Test Codebusters Cipher Decryption 4

Question 1

In an Aristocrat cipher, a three-letter ciphertext word appears far more frequently than any other. Which English plaintext word is it most likely to be?

Accepted Answer

THE

Answer

'THE' is the most common three-letter word in English, so the most frequent three-letter ciphertext word almost always represents it.

Question 2

In an Aristocrat, a single-letter ciphertext word can only decrypt to which letters?

Accepted Answer

A or I

Answer

In standard English, only 'A' and 'I' function as complete single-letter words.

Question 3

Which letter is the most common word-initial letter in English, making it a key target when identifying word beginnings in an Aristocrat?

Accepted Answer

T

Answer

'T' begins more English words than any other letter, largely due to words like 'the', 'to', 'that', and 'this'.

Question 4

After establishing X=T and Y=H in an Aristocrat, the frequent three-letter word 'XYZ' almost certainly decrypts to:

Accepted Answer

THE

Answer

With X=T and Y=H already known, XYZ must start with TH; 'THE' is overwhelmingly the most common TH-word.

Question 5

Which category of doubled-letter patterns is most useful when scanning an Aristocrat for doubled-letter clues?

Accepted Answer

LL, SS, EE, OO

Answer

LL, SS, EE, and OO are the most common doubled-letter pairs in English and appear as repeated adjacent ciphertext letters.

Codebusters Test Practice Test

Codebusters Test Practice Test

Codebusters Test Codebusters Cipher Decryption 4